Ayrton-Perry approach for the lateral-torsional buckling resistance of mono-symmetric I-section beams

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-03-04 DOI:10.1016/j.tws.2025.113125

L. Simões da Silva , J.O. Gomes Jr. , J.O. Ferreira Filho , H. Carvalho

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Abstract

The Ayrton-Perry approach is the base of the Eurocode 3 design rules for the verification of the buckling resistance of prismatic members, in which different buckling curves associated to different imperfection factors are suggested according to the sections, steel grades, and other parameters. In the revised version of Eurocode 3, the lateral-torsional buckling resistance of simply-supported doubly-symmetric I-section beams is prescribed using a formulation based on the Ayrton-Perry approach and combined with a calibrated generalized imperfection. However, for mono-symmetric I-beams, the General Case predicted in the last version of Eurocode 3 has been maintained, which results in large scatter and an inconsistent design. This paper extends the new Ayrton-Perry approach available in the new version of Eurocode 3 to deal with simply supported mono-symmetric I-section beams under different loading conditions. An advanced numerical model is built and validated to conduct a reliable parametric study in order to assess the available design methodologies and the proposed extended formulation. It is concluded that the proposed formulation exhibits safe-sided results which better agreement with experimental results and advanced numerical simulations, providing more economic and sustainable solutions for mono-symmetric members.

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单对称工字截面梁侧扭屈曲抗力的Ayrton-Perry方法

Ayrton-Perry方法是欧洲规范3中验证柱形构件抗屈曲能力的设计规则的基础，其中根据截面、钢种和其他参数，提出了与不同缺陷因素相关的不同屈曲曲线。在欧洲规范3的修订版中，简支双对称工字截面梁的侧向扭转屈曲抗力使用基于Ayrton-Perry方法的公式并结合校准的广义缺陷来规定。然而，对于单对称工字梁，欧洲规范3最后版本中预测的一般情况一直保持不变，这导致了大的散射和不一致的设计。本文扩展了新版欧洲规范3中可用的新的Ayrton-Perry方法来处理不同荷载条件下的简支单对称工字截面梁。建立并验证了先进的数值模型，以进行可靠的参数研究，以评估可用的设计方法和提出的扩展公式。结果表明，该公式具有较好的安全性，与实验结果和先进的数值模拟结果吻合较好，为单对称构件提供了更经济和可持续的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.